Still images have been making the rounds, but this is the first time I saw a video of this unusual cloud phenomenon that was sighted recently:
Massive 'cloud waves' roll over Alabama
And if you haven't seen them, here's what they are:
"Breaking waveforms of Kelvin-Helmholtz clouds are the result of shearing winds up at cloud level."
Weekly Climate and Energy News Roundup #288
1 hour ago